Split a List<T> into a List<List<T>> of nth size

gistfile1.txt

public static List<List<T>> ChunkInto<T>(this IList<T> source, int chunkSize)
{
    return source
        .Select((x, i) => new { Index = i, Value = x })
        .GroupBy(x => x.Index / chunkSize)
        .Select(x => x.Select(v => v.Value).ToList())
        .ToList();
}

Handy function to split/chunk a large List into small nth size Lists - List<List>